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• Getting started with server and system adminstration

  - by sid__

  I am web developer and I have been doing a lot of server configurations and system administrative tasks lately I was wondering if someone could recommend books and tutorials that would help understand how things are done the right way. Though I mostly work with Apache and Nginx for configuring and maintaining my applications, my approach has been largely trial and error based with information off google and blogs. Could someone recommend books that explain how to get started with system administrative tasks (preferably in a tutorial fashion so that I may try and understand the workings of the system). I work mostly on Linux systems on EC2 Thanks in advance.

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• Not able to install LTT tool in 10.04

  - by Ashoka

  I have tried the below commands to install LTT on VMware running Ubuntu 10.04, but got the following error. Please help. From link : https://launchpad.net/~lttng/+archive/ppa $ sudo apt-add-repository ppa:lttng/ppa $ sudo apt-get update $ sudo apt-get install lttng-tools lttng-modules-dkms babeltrace user@usr:~$ sudo apt-add-repository ppa:lttng/ppa Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv C541B13BD43FA44A287E4161F4A7DFFC33739778 gpg: requesting key 33739778 from hkp server keyserver.ubuntu.com gpg: unable to execute program `/usr/local/libexec/gnupg/gpgkeys_curl': No such file or directory gpg: no handler for keyserver scheme `hkp' gpg: keyserver receive failed: keyserver error user@usr:~$ user@usr:~$ sudo apt-get update ..... $ user@usr:~$ sudo apt-get install lttng-tools lttng-modules-dkms babeltrace Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package lttng-tools user@usr:~$ My systemm details: user@usr:~$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.04 DISTRIB_CODENAME=lucid DISTRIB_DESCRIPTION="Ubuntu 10.04.4 LTS" user@usr:~$ user@usr:~$ user@usr:~$ uname -a Linux usr 2.6.32-42-generic #95-Ubuntu SMP Wed Jul 25 15:57:54 UTC 2012 i686 GNU/Linux user@usr:~$ Regards, Ashoka

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• How to progress far enough in a year [on hold]

  - by xCasper

  So I came to a realization the other day, I graduate in a year. I will have completed my four year degree in about two and a half (I went to a school that goes full time year round). Anyway, I want to get a job, as a programmer, when I graduate. The problem is, I feel like I am no where near ready. In the last year I cant say I have made any spectacular projects. I know that my advanced programming courses are coming up, but by the time I take them, I will be graduating in 6 months. Not nearly enough time to really take what I learn, apply it, and create something to show for myself. I want to push myself ahead of the game; mainly because my major is Computer Information Systems, so the focus is not programming. In fact, I only get, 4 programming classes. Before anyone says anything, CIS is the closest to a programming major at my school that I am able to do. So the questions come down to this: 1) What can I do to really step up the speed at which I progress (on my own) 2) Should I be aiming for a certain amount of projects in my "Portfolio." 2a) Should they be big projects? P.S: The language we have used in school in c++, I do take a Java class in the spring, and .net over Summer; if any of that matters for anything.

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• Representing a world in memory

  - by user9993

  I'm attempting to write a chunk based map system for a game, where as the player moves around chunks are loaded/unloaded, so that the program doesn't run out of memory by having the whole map in memory. I have this part mostly working, however I've hit a wall regarding how to represent the contents of each chunk in memory because of my so far limited understanding of OOP languages. The design I have currently has a ChunkManager class that uses a .NET List type to store instances of Chunk classes. The "chunks" consist of "blocks". It's similar to a Minecraft style game. Inside the Chunk classes, I have some information such as the chunk's X/Y coordinate etc, and I also have a three dimensional array of Block objects. (Three dimensional because I need XYZ values) Here's the problem: The Block class has some basic properties, and I had planned on making different types of blocks inherit from this "base" class. So for example, I would have "StoneBlock", "WaterBlock" etc. So because I have blocks of many different types, I don't know how I would create an array with different object types in each cell. This is how I currently have the three dimensional array declared in my Chunk class: private Block[][][] ArrayOfBlocks; But obviously this will only accept Block objects, not any of the other classes that inherit from Block. How would I go about creating this? Or am I doing it completely wrong and there's a better way?

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• Where to start when setting up a gambling website [closed]

  - by molleman

  I don't know if this is the correct place or this question by I couldn't find anywhere else. I am looking into building a gambling website, I have good HTML CSS and JavaScript skills but I do not know enough of the server side to actually build a backend for a gambling website. Firstly where would you start , what language , I work With Wordpress , so I understand php a little but not a lot . Would php be a good place to start . If so what framework would be able to scale if the number of users on the website increased . clearly I would like a backend where you could view 1. Users 2. Transactions 3. input games which you can bet on And so on.. Also users should be able to see all there associated information If anyone could help that would be great.

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• Salary Negotiation; How Best to Broach the Subject? [closed]

  - by Ed S.

  So I have an upcoming performance review / salary increase and I am at a point in which I believe I will need to negotiate a larger raise than what is to be proposed. As I suspect this may be the case I have been reading as much information on the subject (negotiation) as possible. I work for a great company and fortunately I work under some really talented and reasonable managers. Unfortunately, I am not sure how best to bring up the subject. I don't want to sound greedy and I don't want to start off on the wrong foot. For the sake of argument, assume that I am actually worth more than I am being paid at the moment and I would like to make a counter offer for a relatively large increase (say, boss says 4%, I would like to counter with 15%. I know that seems very large, but I believe I have a case for it.) My question to you, those who are/have been on the other side of this scenario, is how should I start the conversation? What approach would make you most receptive to my plea? I've never negotiated before and I just don't want to start off on the wrong foot. My direct manager is a very straightforward individual, so sugarcoating is not necessary here, but at the same time, I don't want to seem overly aggressive or demanding. Thanks in advance for any advice you can offer.

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• RUNIT - created first service directory, "sv start testrun" does not work

  - by Veseliq

  I'm pretty new to runit. I installed it on a Ubuntu host. What I did: 1) created a dir testrun in /etc/sv 2) created a script run in /etc/sv/testrun/run, the script content: #! /bin/bash exec /root/FP/annotate-output python /root/FP/test.py | logger -t svtest 3) If I call directly /etc/sv/testrun/run it executes successfully 4) I run sv start testrun (or sv run testrun, sv restart testrun), all of them end up with the same error msg: fail: sv: unable to change to service directory: file does not exist Any ideas what am I doing wrong? I'm new to runit and base all my actions on the information found here: http://smarden.org/runit/

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• Windows xp keeps rebooting itself every morning at 8am?

  - by mark

  Hi, I've got windows xp sp3. It seems to restart itself every morning at 8am (judging by the windows logs, I can see all apps log a startup at 8am every day). Whenever I get to the machine in the morning (around 9 am) I see it's rebooted. I've checked that automatic updates are off, and that the power management settings are set to "always on". I'm not sure what else could be causing the machine to reboot, not sure where to start looking. Any ideas? Thanks ---------- update ---------------- Just looking at the Event Viewer, I see a log message at 8:00:47am every day, which looks like a reboot log statement: Microsoft (R) Windows (R) 5.01.2600 Service Pack 3 Multiprocessor Free. For more information, see Help and Support Center at ...

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• Multiple SSL domains on the same IP address and same port?

  - by John

  This is a Canonical Question about Hosting multiple SSL websites on the same IP. I was under the impression that each SSL Certificate required it's own unique IP Address/Port combination. But the answer to a previous question I posted is at odds with this claim. Using information from that Question, I was able to get multiple SSL certificates to work on the same IP address and on port 443. I am very confused as to why this works given the assumption above and reinforced by others that each SSL domain website on the same server requires its own IP/Port. I am suspicious that I did something wrong. Can multiple SSL Certificates be used this way?

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• remove "items 1-9 of X" from google result

  - by OSdave

  the results of my Magento based website's categories includes "items 1 - 9 of X" before the actual description of the category. How can I get rid of this? In this snapshot, what I want to delete is the red rectangle edits: @Su, these are the reason: Having text like (Items 1 - 9 of 144 –) appear in a Google listing uses up the 25 word limit that Google allows us. More importantly, the first few words of the description can persuade or dissuade someone from visiting my site. This text will not positively influence people to visit my site. @DisgruntledGoat this information shows up in the source code of that page, like this: <table class="toolbar" border="0"> <tr> <td class="pager" style="width: 414px;"> <table class="pager" cellspacing="0"> <tr> <td>Items 1 to 9 of 144 total</td> </tr> </table> </td> </tr> </table>

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• Converting Visio (.vsd) files to pdf automatically [migrated]

  - by Aseques

  I am trying to create a scheduled task to convert all my .vsd files to pdf so all of our devices can read them (linux, mac, smartphones, etc..) and I would prefer not paying for something that can be done with Visio + PDFcreator. The approach of using openoffice doesn't work with .vsd files since it's not a supported format ( Method/tools for batch-converting Microsoft Word files into PDF?) What I've currently is this: 'C:\Program Files\Microsoft Office\Visio11\VISIO.EXE' /pt "Z:\Archive\Files.vsd",-PPDFCREATORPRINTER /nologo That is able to open automatically the document I want and to prepare it to be printed, the only missing part is that it requires me to confirm on the printing dialog. There's some information here: http://support.microsoft.com/kb/314392 but it doesn't explain abotu non interactive printing.

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• What do BCU.exe and BCUService actually do?

  - by ChrisF

  I've got a Gigabyte G32M-ES2L motherboard with an Intel Core 2 Duo E7500 2.93GHz CPU running Windows XP SP3 (fully up to date). Today when I booted the machine my firewall (Sygate Personal Firewall) warned me that BCUService.exe wanted to make a call out to the internet. Wondering what they were I did a Google search and while I found out that these programs weren't malware, I didn't find out what they actually do. The information seemed to boil down to: Part of Browser Configuration Utility Auto-recovery Service from DeviceVM, Inc. This program is not important for your system process, but should not be terminated unless suspected to be causing problems. Source So before I remove them from my system does anyone know what they actually do and its it worth them taking over 4Mb of memory?

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• phpmyadmin error #2002 cannot connect to mysql server

  - by Joe

  I am getting the error in the title when trying to connect to my MySQL server. I have reinstalled MySQL and PHP several times and tried a slew of command line work based on information I searched out. web.mysql is running and I know that my mysql.sock exists and is located in ~/private/tmp/ and also in ~/tmp/. I also have plenty of hard drive space. I have installed and setup phpMyAdmin correctly only adding a password to 'Password for config auth'. I have also connected to the server via Sequel Pro. Why can't I connect to the server via phpMyAdmin? I'm on a 64-bit Intel Mac running Snow Leopard

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• Windows 7 spins up HDD when files should be on SSD

  - by ZorroDeLaArena

  I run 64-bit Windows 7 Ultimate off a Corsair 12GB SSD (cmfssd-128gbg2d) and I've got two older HDDs I use for storing media. However even though the operating system and all the programs are installed on the SSD, frequently when I'm starting programs, I can hear the computer spin up one of the HDDs before the app starts and I'm not sure why (and I don't know which drive it is). For programs that should open very quickly - Programmer's Notepad, Calculator (the basic one that comes with Windows), etc. - having to wait several seconds sometimes can be pretty obnoxious. Avoiding wait times like that are why I got the SSD in the first place. Is there any way to tell why that's happening? I'm happy to provide more information but I'm not sure what's important. Any help would be really appreciated!

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• Web-Service: How much would you charge? [closed]

  - by jacksbox

  I´ve to make an offer to a client who wants me to develope a web-service for him. I have some trouble calculating the pricing - can you help me? Here is a rough outline of the project: It´s a portal on which various artists and entertainers can register and administrate there profile (texts, gallerie, some embedded videos, choose categories and radius of offer, etc). Other user can browse the artists by 3-4 level categories and countries/staats. If someone wants to hire a artists, he can put them in an "shopping-basket" and can mail everyone in his basket. The Artists can answer them with a form on the website (he doesn't get the email of the other person). Users should be able to comment/rate the artists. But if an artists wants this comments/ratings visible on his profile he must pay, and after that, the admin of the site must activate this comments/ratings. So, no more information given, what would you charge (ca.)? Edit: It´ll be developed with php/codeigniter. A .psd design is already there.

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• Model View Controller² [closed]

  - by user694971

  I am working on a quite complex web application in Go and I tried to stay in an MVC pattern. However, I ended up having a structure isomorphic to this: /boilerplate The usual boilerplate an application needs to survive in the wilderness /db Layer talking to an SQL DB /helpers Helpers /logic Backend logic, not directly affiliated with any routes, sessions etc. /templates View /web Glue between /logic and /templates. In more dynamic languages the size of /web would be next to zero. But Go doesn't exactly have a RoR integrated so I need a lot of helper structures to feed the templates with data, to process GET/POST parameters and session information. I remember once reading about patterns similar to MVC with one extra letter but Wiki-searching I couldn't find it right now. (BTW currently /logic also contains data retrieval from API services to fill some hash maps; this is no simple task, but that probably belongs into the model, right?) So question: is this structure considered sane? Or does it need some bending to be tagged MVC app?

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• What happened to WinFS?

  - by Console

  The most interesting feature that was ever connected to what eventually became Vista was WinFS, a revolutionary (so it seemed, at least back then) new way of storing and accessing information on a computer. This feature was cut despite actually reaching a closed alpha/technical preview release. There was a smoke and mirrors blog post from MS about the technology living on in an upcoming SQL server release, but to me it just felt like it was axed, hard. Does anyone have any idea what happened to it? Is it killed, or just on the backburner? Was it just impossible to implement, too expensive, or did someone think of a better idea? Are there any projects (From MS or anyone else) that have similar goals?

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• Should I Open Source? [closed]

  - by Howdy_McGee

  My company recently created a full javascript, html & css Virtual Tour. Since it is html based there is no real way of securing our information/code so selling it could be flimsy. We are an extremely small company, barely on the map so I was thinking that by making this an open source project it could give us a chance to jump start our SEO by page views alone, especially if we provide documentation. Not to mention hopefully bring a community following on our blog. On the other hand though could this possibly hurt our sales as a web development company? If we are handing out this cool "plugin" we made what keeps people from making it commercial somehow? So I'm trying to weigh the options on whether I should make this Open Source or not and the pros / cons of each especially for a small business. What do you guys think about making things Open Source? How do I know if this product is the right thing to make Open Source? What are some pros and cons to going Open Source?

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• Static vs. dynamic memory allocation - lots of constant objects, only small part of them used at runtime

  - by k29

  Here are two options: Option 1: enum QuizCategory { CATEGORY_1(new MyCollection<Question>() .add(Question.QUESTION_A) .add(Question.QUESTION_B) .add...), CATEGORY_2(new MyCollection<Question>() .add(Question.QUESTION_B) .add(Question.QUESTION_C) .add...), ... ; public MyCollection<Question> collection; private QuizCategory(MyCollection<Question> collection) { this.collection = collection; } public Question getRandom() { return collection.getRandomQuestion(); } } Option 2: enum QuizCategory2 { CATEGORY_1 { @Override protected MyCollection<Question> populateWithQuestions() { return new MyCollection<Question>() .add(Question.QUESTION_A) .add(Question.QUESTION_B) .add...; } }, CATEGORY_2 { @Override protected MyCollection<Question> populateWithQuestions() { return new MyCollection<Question>() .add(Question.QUESTION_B) .add(Question.QUESTION_C) .add...; } }; public Question getRandom() { MyCollection<Question> collection = populateWithQuestions(); return collection.getRandomQuestion(); } protected abstract MyCollection<Question> populateWithQuestions(); } There will be around 1000 categories, each containing 10 - 300 questions (100 on average). At runtime typically only 10 categories and 30 questions will be used. Each question is itself an enum constant (with its fields and methods). I'm trying to decide between those two options in the mobile application context. I haven't done any measurements since I have yet to write the questions and would like to gather more information before committing to one or another option. As far as I understand: (a) Option 1 will perform better since there will be no need to populate the collection and then garbage-collect the questions; (b) Option 1 will require extra memory: 1000 categories x 100 questions x 4 bytes for each reference = 400 Kb, which is not significant. So I'm leaning to Option 1, but just wondered if I'm correct in my assumptions and not missing something important? Perhaps someone has faced a similar dilemma? Or perhaps it doesn't actually matter that much?

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• Social Media event Bandwidth requirements

  - by Bob G

  I have an one day event in July 2012, hosting 250 attendees for a social media event. We will be uploading live video to a website, allowing the press to access the web, and some vendors will be showing off their web sites for clients and visitors. The staff will need access for uploading files and information as needed. We had the event last year and tried a cable modem brought in with 2x2 megs just for the streaming video which worked well. I had 4 wireless hot spots, rented from a company 1.5 mbps x 780 kbps, which was were a complete failure. I was assured the 4 hot spots would be enough, but they did not work. What would be the proper way to get the bandwidth required to make the one day event successful? The setting is a Private Country Club where running cables everywhere is very tough.

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• Upgraded from 11.10 to 12.04 now no network access

  - by MadeTheLeap

  A few weeks ago I decided I should enter the Linux world and read that Ubuntu is the most widely used release. I installed version 11.10 and it worked perfectly. Just this past week I decided I would do the upgrade to 12.04. The upgrade process itself worked fine. However, when I logged in I no longer had a network connection. I am running an AMD-based PC with a D-LINK DFE-530TXS network card and as I said, it worked fine in 11.10. I have scoured the Internet and come across a thousand slightly varying solutions, but they are too convoluted for someone new to Linux. Not because I can't follow the steps, but because most of the tools/utilities that are referenced (e.g. to compile, install, etc.) are not available when I use the stated steps in the solutions. So....should I re-install 11.10 or is there hope in getting this version to use the NIC that I know works. I have the latest driver from d-link for my NIC but I have no idea how to 'install' it for Ubuntu 12.04 to use. I know you will require additional information, but I wasn't sure what you would need. Thanks in advance.

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• how to fight back attacks on my web service

  - by user12145

  My apache webservice is getting a large quantity of requests over the days, each one with somewhat random login to gain access. I identified about 60 such ips(a few sample below), all belong to google. is there a way to find more information about the origin of the attacker? or should I just block these ips. secondly, should I attempt to block the identified ips subnets(74.125.46.*) as a preventive measure? 72.14.194.65 64.233.172.20 74.125.75.19 72.14.194.33 74.125.46.87 74.125.44.91 74.125.46.91

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• Getting much higher than usual brute-force attempts on cPanel

  - by UserZer0

  Although I have many client accounts on my cPanel based server I'm really the only one who has login information to any of the accounts. I have cPhulk setup to alert me and blocking after 4 failed attempts. I usually have only a handful of bots trying to get in each day(2 hosts ago I never had any), but Today the rate has significantly increased, every 10 minutes or so(no not like clockwork, just averaging). Should I be concerned? Is there anything extra I should be doing, is there any automated reporting services I can use? Thanks.

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• Rescue data from damaged hard disk

  - by Lexsys

  Hello. I have a 500 GB hard drive with one NTFS-partition on it. I can mount it with Ubuntu and view the contents. But when I try to copy something, I get an I/O error. Ok, I tried to make its image with dd. I/O error as soon as it starts. I have installed ddrescue, but its manual page says not to use it with drives, failing on I/O. Can I manage to get some information from this drive and how to do this?

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• Searching for online database software/cms

  - by ButterdBread

  I am searching for a software or CMS that manages and displays large online databases, as some kind of frontend to MySQL or any other database. It should be accessible through the browser, be as secure as possible (offering login). The data I'd like to store would be personal information such as name, adress and birthday - also I'd need to be able to add custom fields as well. Also forms and the possibility to download the data in an excel? table would be great. PHPmyadmin is not an option, it should be similar to a CRM but more closely adapted to managing database tables, searching for entries and filtering data. It should be possible to have many user accounts with different rights, with each of them being able to acces certain parts of the data and entering own data. Is there something out there, that might get close to what I imagine? I appreciate any help!

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